Light Art

As an example artist Austine Wood Comarow works with pure polarized light passing through birefringent materials to create interactive and morphing images. This art form uses no pigments whatsoever, deriving prismatic colors purely from birefringence.
Also included in the light art genre is the so-called light graffiti including projection onto buildings, arrangement lighted windows in buildings and painting with hand-held lights onto film using time exposure.